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We used AFR 210 heads on Steve's 385 and man are they nice pieces for the price. They flowed 299 cfm (intake side) right out of the box. The CNC'd ones would have flowed over 304 cfm out of the box but they were $500 more. We were well over 600 HP and had 13 to 1 compression too. MAchine shop did not fly cut the pistons enough and well lets say it did not last long !!!